Heatranger 440/460/480/499KB

Transcription

1 Servicing Instructions Heatranger 440/460/480/499KB For use in GB and IE DESN B REMEMBER, when replacing a part on this appliance, use only spare parts that you can be assured conform to the safety and performance specification that we require. Do not use reconditioned or copy parts that have not been clearly authorised by AGA. PLEASE READ THESE INSTRUCTIONS BEFORE SERVICING THIS APPLIANCE raywarranty@aga-web.co.uk 05/14 EINS E

2 Contents SECTION CONTENTS PAGE CONSUMER PROTECTION 4 HEALTH & SAFETY 4 INTRODUCTION 5 SERVICE SCHEDULE 5 BURNER REMOVAL PREPARATION 6 BURNER ACCESS 6 BURNER REMOVAL 7 CLEANING HEAT EXCHANGER CLEANING 8-10 OVEN AND HOTPLATE FLUEWAY CLEANING 10 BURNER SERVICING INTRODUCTION 11 BURNER NOZZLE REMOVAL 12 BURNER NOZZLE REPLACEMENT 12 PHOTO ELECTRIC CELL (PEC) CLEANING 13 FAN CLEANING 13 RE-ASSEMBLE BURNER 13 OIL PUMP SERVICING INTRODUCTION 14 OIL PUMP STRAINER CLEANING 14 OIL LINE FILTER CLEANING 14 RE-COMMISSIONING BLEED AIR FROM OIL SUPPLY 15 FIT PRESSURE GAUGE 15 VENT OIL PUMP 15 ADJUST OIL PRESSURE 15 SET COMBUSTION AIR 16 CHECK SMOKE 16 REPLACEMENT OF PARTS - FAN MOTOR 17 (BURNER) IGNITION ELECTRODES 17 IGNITOR 18 RELAY 18 SOLENOID COIL 18 CONTROL BOX 19 PEC 19 PUMP ACCESS 20 REPLACEMENT OF PARTS - ELECTRICAL COMPONENT ACCESS ELECTRICAL CONTROLS TO FIT NEW BOILER CONTROL THERMOSTAT 23 TO FIT NEW BOILER PUMP OVERRUN THERMOSTAT 23 TO FIT NEW COOKER SAFETY OVERHEAT THERMOSTAT 24 TO FIT NEW BOILER SAFETY OVERHEAT THERMOSTAT 25 TO FIT NEW OVEN CONTROL THERMOSTAT 25 TO FIT NEW PROGRAMMER 26 TO FIT NEW SELECTOR SWITCH 26 RE-ASSEMBLE 27 REPLACEMENT OF PARTS - VENT FAN 28 (VENT FAN) VENT FAN SWITCH 28 ELECTRICAL CONTROLS PUMP OVERRUN FACILITY 29 OVERHEAT SAFETY THERMOSTATS 29 CONTROL CIRCUIT - EXTERNAL 30 CONTROL CIRCUIT - BOILER 31 CONTROL CIRCUIT - COOKER 32 2

3 Contents SECTION CONTENTS PAGE FAULT FINDING WIRING DIAGRAM - APPLIANCE 33 BURNER DOES NOT START 34 INFORMATION SYSTEM COOKER BURNER (COOKER BURNER TYPE DKO 970) INFORMATION SYSTEM COOKER BURNER (COOKER BURNER TYPE DKO 970N) FAULT FINDING - BOILER FAULT FINDING - COOKER HIGH SMOKE NUMBERS/OIL SMELLS 43 3

4 Consumer Protection As responsible manufacturers we take care to make sure that our products are designed and constructed to meet the required safety standards when properly installed and used. IMPORTANT NOTICE: PLEASE READ THE ACCOMPANYING WARRANTY Any alteration that is not approved by AGA could invalidate the approval of the appliance, operation of the warranty and could affect your statutory rights. Health & Safety This appliance may contain some of the materials that are indicated. It is the Users/Installers responsibility to ensure that the necessary personal protective clothing is worn when handling where applicable, the pertinent parts that contain any of the listed materials that could be interpreted as being injurious to health and safety, see below for information. Firebricks, Fuel beds, Artificial Fuels When handling use disposable gloves. Fire cement When handling use disposable gloves. Glues and Sealants Exercise caution - if these are still in liquid form use face mask and disposable gloves. Glass Yarn, Mineral Wool, Insulation Pads, Ceramic Fibre May be harmful if inhaled. May be irritating to skin, eyes, nose and throat. When handling avoid contact with skin or eyes. Use disposable gloves, face-masks and eye protection. After handling wash hands and other exposed parts. When disposing of the product, reduce dust with water spray, ensure that parts are securely wrapped. Kerosene & Gas Oil fuels (mineral oils) 1. The effect of mineral oils on the skin vary according to the duration of exposure. 2. The lighter fractions also remove the protective grease normally present on the surface of the skin. This renders the skin dry, liable to crack and more prone to damage caused by cuts and abrasions. 3. Oil acne is recognised by the presence of skin rashes. The arms are most often affected, but may occur where there is contact with oil or oily clothing. - Seek medical attention for any rash. - Avoid skin contact with mineral oil or clothing contaminated with mineral oil. 4. Inhalation of mineral oil vapours must be avoided. Never fire the burner in the open as unburnt oil vapours are likely to occur. 5. Use a suitable barrier cream which will give protection against mineral oil, lanolin based hand creams are usually very effective. 6. Never syphon mineral oils by use of the mouth. If accidentally swallowed, call a doctor, do not induce vomiting. NOTE: SMOKE/SMELL EMITTED DURING INITIAL USAGE Some parts of the cooker have been coated with a light covering of protective oil. During initial operation of the cooker, this may cause smoke/smell to be emitted and is normal and not a fault with the appliance, it is therefore advisable to open doors and or windows to allow for ventilation. Lift the lids to prevent staining the linings. 4

5 INTRODUCTION To ensure the best performance from your Rayburn it should be serviced once a year; preferably at the start of the heating season. This appliance must be commissioned by a competent engineer, such as OFTEC approved or a commissioning engineer as shown on the Rayburn list. Failure to install and maintain appliances correctly could lead to prosecution. An additional flueway and combustion chamber clean halfway through the heating season may be necessary in some cases. The Rayburn cannot be serviced whilst hot, so both oven and boiler thermostats should be turned off on the evening before the service visit. Annual Service SERVICE SCHEDULE During annual service flexible oil line, burner nozzles and burner head seals MUST BE CHANGED. WIRING: Ensure there is no damage or loose connections. This should be carried out by a competent engineer. BURNER REMOVAL - for cleaning and inspection. CLEANING - Boiler heat exchanger flueways, oven and hotplate flueways together with ceramic fibre burner chambers. BURNER SERVICING. OIL PUMP SERVICING - Cleaning of fuel line strainer. RE-COMMISSIONING. REPLACEMENT PARTS. Oven Door Fit - Both doors must be checked and adjusted if necessary to ensure the alignment with the door catch is correct, the keep is secure and the oven is sealed when the door is closed. Additional Flueway Clean It may be necessary in some installations to give the boiler flueways a clean out at the end of the heating season. Balanced Flue Terminal Check terminal housing for ingress of foreign matter - dust leaves etc. Check terminal area is clear of any obstructions which would hinder the dispersal of the products of combustion and clean air entry. If necessary remove Terminal Housing, for cleaning of ducts and airways, and ensure that all sealed joints are remade on re-assembly. Replace terminal guard. 5

6 Burner Removal PREPARATION WARNING: BEFORE REMOVING SERVICE ACCESS COVERS OR THE OIL BURNERS ENSURE THAT ALL ELECTRICAL SUPPLIES TO THE APPLIANCE HAVE BEEN ISOLATED The burners can be removed without disconnecting the oil supply pipe. However if the filters are being cleaned or a pressure gauge fitted to the pump then the oil supply should be turned OFF and arrangements made to catch any oil which will leak from the oil pump. SEE FIG. 1 BURNER ACCESS 1. Open up the bottom burner access door. Remove door and put in a safe place. 2. Remove the 4 inner panel securing screws and remove panel. 3. Remove the 3 plinth securing screws and remove plinth. Fig. 1 DESN

7 Burner Removal IMPORTANT: DURING BURNER REMOVAL CARE MUST BE TAKEN NOT TO DAMAGE THE CERAMIC FIBRE INSULATION. SEE FIG. 2, 3 & 4 BURNER REMOVAL 1. Place a sheet on the floor in front of the cooker to act as a working area. 2. Disconnect the 4-pin plug at the side of the burner. 3. Disconnect air intake. Fig. 2 DISCONNECT 4-PIN PLUG DESN SEE FIG Undo the central locking nut and remove head retaining bar. 5. Undo burner mounting plate. HEAD RETAINING BRACKET CENTRE LOCKING NUT BURNER LOCKING NUT Fig. 3 DESN SEE FIG Withdraw the burner unit. 7. To remove the burner unit completely, it maybe necessary to disconnect the air intake hose from the burner unit. 7 Fig. 4 DISCONNECT AIR INTAKE DESN A

8 Cleaning HEAT EXCHANGER CLEANING IMPORTANT: DURING CLEANING CARE MUST BE TAKEN NOT TO DAMAGE THE CERAMIC FIBRE INSULATION. SEE FIG Lift insulation covers and remove hotplate using lifting hooks provided. Fig. 5 DESN SEE FIG Remove the 4 flue cleaning access door securing bolts and remove door. 3. Using the rods provided remove the boiler flueway baffles from between the boiler cross waterways. The baffles are assembled in alternate directions to allow the gases to flow front to back through the assembly. Each heat exchanger has two rows of baffles. Ensure that the baffles are having the top and bottom plates of the same width and marked TOP are fitted last. One at top each flueway. Total number of baffles fitted are:- 440 = 6 (2 x 3) 460 = 6 (2 x 3) 480 = 8 (2 x 4) 499 = 10 (2 x 5) Fig. 6 DESN

9 Cleaning Fig. 6A 9

10 Cleaning SEE FIG Lift top plate enamelled cover panel (behind LH insulating cover) remove insulation pad and sealing plate. 5. Clean the boiler outlet flueway by inserting the flexible brush through the top plate aperture, directing it towards the flue outlet. Scrape the deposits towards the heat exchanger. 6. Thoroughly clean boiler heat exchanger flueway. 7. Carefully vacuum any debris that has fallen down into the burner chamber. 8. Clean and replace boiler flueway baffles in reverse order. Locate boiler flue access door, secure. 9. Replace sealing plate, insulation pad and cover panel. COVER PANEL INSULATION PAD Fig. 7 DESN OVEN & HOTPLATE FLUEWAY CLEANING SEE FIG Remove the top oven door and place in a safe position. 2. Remove side and base access doors use hex. driver. 3. Thoroughly clean top, side and base flueways through access apertures with brush. 4. Remove all debris with vacuum cleaner. 5. Replace side and base access doors. Secure in position using hex. driver. 6. Brush and clean in between hotplate ribs on underside. 7. Examine soft rope seal located around hotplate aperture in top plate and two rope seals on hotspot. Replace if frayed or damaged. 8. Replace hotplate ensuring the underside ribs lie over the oven, and that it seals the top plate. 10 Fig. 8 DESN

11 Burner Servicing INTRODUCTION SEE FIG. 9, 10A, 10B & 10C It is recommended that each side of the burner is serviced individually so as not to get the components from the two burners mixed up. BOILER 8 VANES The correct combination of burner blast tubes and diffusers are shown. To remove blast tube, slacken grub screws and pull forwards. COOKER 10 VANES Fig. 10A 440/460KB BOILER 10 VANES 3mm HOLES SMALL SLOTS Fig. 9 COOKER 10 VANES Fig. 10B 480KB BOILER 10 VANES 5mm HOLES LARGE SLOTS COOKER 10 VANES 11 Fig. 10C 499 KB

12 Burner Servicing BURNER NOZZLE REMOVAL SEE FIG Disconnect ignition leads 2. Remove two socket head screws. 3. Remove head assembly complete. 4. Remove ignitor assembly, by removing countersunk screw and clamp. 5. Unscrew nozzle from its holder with a correctly fitting tubular spanner to avoid damage to hexagon. Fig. 11 DESN BURNER NOZZLE REPLACEMENT SEE FIG. 12 3mm 1. Replace nozzle by a new one of the same make and specification. MODEL NOZZLE TYPE COOKER BOM CODE NOZZLE TYPE BOILER BOM CODE 440KB 80 S RO4M H RO4M KB 480KB 80 EH 80 EH RO4M RO4M EH 80 EH RO4M RO4M Fig. 12 DESN KB 80 EH RO4M EH RO4M Ensure that mating faces are clean. 3. Hold nozzle holder with correct spanner when tightening nozzle. 4. Typically finger tight plus 1/4 turn with spanner is sufficient. DO NOT OVERTIGHTEN. 5. Ensure electrode gaps are correct. 12

13 PHOTO ELECTRIC CELL (PEC) CLEANING SEE FIG. 13 Burner Servicing Withdraw Photo Electric Cell from the burner head. Clean PEC sensing end with a soft cloth taking care not to scratch the light sensitive body. Re-insert PEC taking care to insert the correct way round. Should the cell show signs of distortion or cracking, replacement will be necessary. See PEC replacement, page 19. Fig. 13 DESN FAN CLEANING 440KB & 460KB 440/460KB ONLY 1. Clean between the blades of the fan impellor with a small brush and remove any residue. The fan motor flange has 4 fixings to the fan case. 480/499KB ONLY 1. Remove 4 fixing screws and pull off fan case inlet. 2. Clean between the blades of the fan impellor with a small brush and remove any residue. Fig. 14 DESN RE-ASSEMBLE BURNER 480KB & 499KB SEE FIG. 14 & 14A Re-assemble the burner in reverse order. NOTE: Burner head gaskets should be renewed at each service. 13 FIG. 14A DESN

14 Oil Pump Servicing INTRODUCTION To carry out servicing on the oil pump. Turn off the oil line isolating valve near to the appliance. SEAL STRAINER OIL PUMP STRAINER CLEANING COVER SEE FIG Remove 4 socket head screws. 2. Remove filter. 3. Wash with clean petrol or paraffin. 4. Re-assemble filter in reverse order. OIL LINE FILTER CLEANING FUEL INLET 1. Turn OFF the line isolating valve fitted prior to the oil line filter. 2. Follow manufacturer s instructions to remove filter element from the housing, taking care to collect Kerosene residue from the filter housing. 3. Wash filter thoroughly in clean petrol or paraffin. 4. Re-assemble in reverse order. Fig. 15 DESN NOTE: Flexible fuel hose (s) must be replaced at each service. 14

15 Re-commissioning BLEED AIR FROM OIL SUPPLY SEE FIG. 17A Disconnect the flexible oil pipe line at the pump inlet, open the stop valve slowly and run off some of the oil into a receptacle to establish an air free supply to the pump. Remake the connection oil tight and leave valve open. FIT PRESSURE GAUGE SEE FIG. 16 Remove the bleed screw from the manifold and fit an oil pressure gauge with R 1/8 connection to check the pump output pressure. SWITCH ON ELECTRICITY Fig. 16 RESET BUTTONS PRESSURE PORT/ BLEED SCREW DESN Set the boiler burner time clock to continuous and turn the boiler thermostat to maximum. The boiler burner should run on pre-purge for 7-15 seconds. With the ignition spark energised. The oil solenoid valve should open allowing the burner to fire. Until all the air from the oil pump is flushed out there may be some flame instability resulting in the burner locking out. This will be shown by the burner stopping and the illumination of the signal light in the reset button of the control box (see Fig. 16). IN THIS EVENT, WAIT AT LEAST ONE MINUTE, then press the re-set button to restart. VENT OIL PUMP SEE FIG. 16 Whilst the burner is running, vent air from the pump by slackening the pressure gauge port sufficient to allow air to bleed air. When bubble free oil seeps out re-tighten. Fig. 17 OIL PRESSURE ADJUSTMENT DESN ADJUST OIL PRESSURE SEE FIG. 17 With the burner running check the oil pressure on the pressure gauge. If the pressure gauge is not indicating the correct reading then adjust the pressure by turning the pressure regulator clockwise to increase or anti-clockwise to decrease the pressure until the pressure gauge reads 10 bar (145Ibf/In 2 ). NOTE: 440KB ONLY Increase/decrease pressure gauge until pressure reaches 8 bar (120Ibf/In 2 ). NOTE: 499KB ONLY During initial start up, the pressure will indicate approximately 100 psi for 30 seconds then up to 10 bar (145Ibf/In). Any adjustments must be made after the sequence has been completed. Fig. 17A OIL PRESSURE ADJUSTMENT DESN

16 Re-commissioning SEE FIG. 18 & 18A SET COMBUSTION AIR After 15 minutes of the boiler burner running. Remove the enamelled top cover panel and the insulation pad. Remove the plugging screw and insert the sensing end of a portable indicator to check the CO 2 (Carbon Dioxide) level. Adjust the boiler burner air intake until a reading of 11/11.5% CO 2 is recorded on the indicator. SEE FIG. 18A CHECK SMOKE Remove the CO 2 sampling tube and using the same hole for flue sampling insert the sensing end of a Baccarach Smoke Pump and check that the smoke in the boiler flue ways does not exceed No.2 on the scale. Replace the plugging screw, insulation pad and cover panel. Switch off the boiler burner. COOKER BURNER - SEE FIG. 18 A Switch on cooker burner After 15 minutes of the cooker burner running. Repeat the above procedures for the cooker burner. To sample the flue gases from the cooker burner lift up the R.H. insulating cover and remove the countersunk headed screw in the hotplate. The cooker burner should be set to 11.0/11.5% CO 2 with a maximum Smoke No. of 2. Replace the countersunk headed screw on completion ensuring that it will not interfere with any pots and pans placed on the hotplate. Fig. 18 BOILER BURNER FLUE GAS SAMPLING HOLE DESN COOKER BURNER FLUE GAS SAMPLING HOLE 16 Fig. 18A DESN

17 Replacement of parts (Burner) FAN MOTOR 440/460KB ONLY SEE FIG. 19 & 19A Follow instructions in sections BURNER ACCESS, Steps 1 to 3 and BURNER REMOVAL, Steps 1 to Remove 3-pin plug. 2. Remove solenoid plug (499KB ONLY). 3. Disconnect oil pipe. 4. Remove four socket head screws. Lift off motor. NOTE: 440K ONLY - Remove 4 screws and withdraw motor. 5. Remove grub screw, slide off fan. Re-assemble in reverse order. NOTE: Ensure that gaskets and seals are in place and in good condition. Fig. 19 DESN /499KB ONLY IGNITION ELECTRODES Follow instructions in BURNER ACCESS, Steps 1 to 3 and BURNER NOZZLE REMOVAL, Steps 1 to 5. SEE FIG Disconnect ignition leads. 2. Remove 2 socket head screws. 3. Remove head assembly complete. 4. Remove ignitor assembly, by removing countersunk screw and clamp. 5. Fit new ignition electrode assembly, re-assemble in reverse order. 6. Check electrode gap and reset if necessary. Fig. 19A DESN Fig. 20 DESN

18 Replacement of parts (Burner) IGNITOR SEE FIG. 21 REMOVE EARTH SCREW Follow instructions in sections BURNER ACCESS, Steps 1 to 3, BURNER REMOVAL, Step Remove both HT leads from ignitor. 2. Remove mains plug from ignitor. 3. Remove earth screw. 4. Remove 2 ignitor securing screws. 5. Remove ignitor. 6. Fit new ignitor, re-assemble in reverse order. Fig. 21 DESN RELAY SEE FIG. 22 Follow instructions in sections BURNER ACCESS, Steps 1 to 3, BURNER REMOVAL Steps 1 to Remove push on connectors (noting position of each connector). 2. Remove two relay fixing screws. 3. Fit relay, re-assemble. Fig. 22 DESN SOLENOID COIL SEE FIG. 23 Follow instructions in sections BURNER ACCESS, Steps 1 to 3, BURNER REMOVAL, Steps 1 to Slacken solenoid plug securing screw. 2. Remove plug. 3. Remove solenoid securing nut and washer. 4. Remove solenoid coil. 5. Fit new solenoid coil, re-assemble in reverse order. 18 Fig. 23 DESN

19 Replacement of parts (Burner) CONTROL BOX SEE FIG. 24 Follow instructions in section BURNER ACCESS. Steps 1 to Undo central fixing screw. 2. Gently pull control box away from base. 3. Fit new control box, re-assemble in reverse order. Fig. 24 DESN PEC SEE FIG. 25 Follow instructions in section BURNER ACCESS, Steps 1 to Withdraw P.E.C. from burner head. 2. Push in retaining clip and slide P.E.C. out. 3. Fit new P.E.C. 4. Re-insert P.E.C., taking care to insert the correct way round. 19 fig. 25 DESN

20 Replacement of parts (Burner) PUMP ACCESS SEE FIG. 26 Follow instructions in sections BURNER ACCESS, Steps 1 to 3 and BURNER REMOVAL, Steps 1 to Isolate fuel supply. 2. Disconnect flexible hose. (This must be replaced annually) 3. Remove solenoid plug. 4. Remove feed pipe. 5. Slacken three securing screws and remove pump. 6. Check drive, replace if worn or damaged. 7. Replace pump, re-assemble in reverse order. PUMP DRIVE PUMP FIXING SCREWS (3) NOTE: 499 KB ONLY FIG. 26 A 1. SOFT START SOLENOID 2. RESTRICTOR DISC Fig. 26 DESN Fig. 26A DESN

21 ELECTRICAL COMPONENT ACCESS BEFORE REMOVING SERVICE ACCESS COVERS ENSURE THAT ALL ELECTRICAL SUPPLIES TO THE APPLIANCE HAVE BEEN TURNED OFF (SWITCH OFF AND REMOVE PLUG). Replacement of parts (Electrical controls) SEE FIG Remove the controls door and place in a safe position. 2. Remove both thermostat control knobs. 3. Remove the 2 cover panel fixing screws. 4. Remove cover panel. It will be necessary to disconnect the push on tags from the selector switch. Fig. 27 DESN B SEE FIG Remove the four control panel fixing screws. 6. Tilt the chassis forwards from the top and lift out. To fully access the rear of the control chassis, the thermostat capillaries should be removed from their pockets. 21 Fig. 28 DESN B

22 Replacement of parts (Electrical controls) Fig. 29 DESN

23 TO FIT NEW BOILER CONTROL THERMOSTAT SEE FIG. 30 Follow instructions in section ELECTRICAL COMPONENT ACCESS, Steps 1 to Undo the two screws on the front of the chassis which hold the thermostat in place. 2. Remove the two push on connectors from back of thermostat. 3. Replace thermostat. Take care to push thermostat phial correctly into the pocket provided. The thermostat should be mounted with tag P at the right hand side. 4. Re-connect push on connector wires. The RED wire to 1 and YELLOW wire to P. Replacement of parts (Electrical controls) To complete follow instructions in section RE- ASSEMBLE, Steps 1 to 6. TO FIT NEW BOILER PUMP OVERRUN THERMOSTAT Fig. 30 DESN A SEE FIG. 31 Follow instructions in section ELECTRICAL COMPONENT ACCESS, Steps 1 to Undo the two screws on the front of the chassis which hold the thermostat in place. 2. Remove the three push on connectors from back of thermostat. 3. Replace thermostat. The thermostat should be mounted with tag P at the left hand side. Take care to push thermostat phial correctly into the pocket provided. 4. Re-connect push on connector wires. The RED wire from the pump to P, the other BROWN wire to 2 and the YELLOW to 1. To complete follow instructions in section RE- ASSEMBLE, Steps 1 to 6. Fig. 31 DESN A 23

24 Replacement of parts (Electrical controls) TO FIT NEW COOKER SAFETY OVERHEAT THERMOSTAT SEE FIG. 32 Follow instructions in section ELECTRICAL COMPONENT ACCESS, Steps 1 to Undo the two screws on the front of the chassis which holds the thermostat in place. 2. Remove the two push on connectors from the back of the thermostat. Open oven door to access the thermostat phial which passes into the oven at top LH corner. 3. Remove LH side plate, slacken screw where the phial passes through RH side and rotate. Slacken screw front phial mounting bracket rotate. (See Fig. 33). 4. Replace thermostat, thermostat phial should be repositioned in the same position as removed. BLACK BLACK Fig. 32 DESN To complete follow instructions in section RE- ASSEMBLE, Steps 1 to 6. 24

25 TO FIT NEW BOILER SAFETY OVERHEAT THERMOSTAT SEE FIG. 33 Follow instructions in section ELECTRICAL COMPONENT ACCESS, Steps 1 to Undo the central hexagon nut on the front of the chassis which holds the thermostat in place. 2. Remove the push on connectors from back of thermostat. 3. Replace thermostat. Take care to push thermostat phial correctly into the pocket provided. 4. Re-connect push on connector wires, as Fig. 33. To complete follow the instructions in section RE- ASSEMBLE, Steps 1 to 6. Replacement of parts (Electrical controls) Fig. 33 DESN TO FIT NEW OVEN CONTROL THERMOSTAT SEE FIG. 34 Follow instructions in section ELECTRICAL COMPONENT ACCESS, Steps 1 to Undo the two screws on the front of the chassis which holds the thermostat in place. 2. Remove the 2 push on connectors from back of thermostat. 3. Open roasting oven door to access the thermostat phial and capillary which pass into the oven at the top left hand corner. 4. Remove LH side plate. Slacken the screw where the phial passes through the roasting oven side and rotate the cover plate to open up the access hole. Slacken screw front phial, mounting bracket and rotate. 5. Replace thermostat. The thermostat should be mounted with tag P at the right hand side. Reposition the phial in same position as removed. 6. Re-connect push on connector. The VIOLET/BLACK wire to 1 and BLACK (3) wire to P, See Fig. 34A. NOTE: Ensure phials do not make contact with oven sides. To complete follow instructions in section RE- ASSEMBLE, Steps 1 to 6. Fig. 34 ENSURE PHIALS DO NOT MAKE CONTACT WITH OVEN SIDES BLACK DESN Fig. 34A VIOLET DESN A

26 Replacement of parts (Electrical controls) TO FIT NEW PROGRAMMER SEE FIG. 35 Follow instructions in section ELECTRICAL COMPONENT ACCESS, Steps 1 to Slacken two screws at bottom of programmer. 2. Pull the bottom of the programmer forward and lift.. 3. Replace with new programmer. Clip onto the hinges at the top. Press bottom into place. Tighten two securing screws. To complete follow instructions in section RE-ASSEMBLE, Steps 3 to 6. Fig. 35 DESN A TO FIT NEW SELECTOR SWITCH SEE FIG. 36 Follow instructions in section ELECTRICAL COMPONENT ACCESS, Steps 1 to To remove switch from the cover panel press the two toggles at the top and bottom of switch, push switch through panel. 2. Push replacement switch into aperture and click into place. The switch should be fitted with terminal 1 at the top. To complete follow instructions in section RE-ASSEMBLE, Steps 3 to Fig. 36 DESN A

27 Replacement of parts (Electrical controls) RE-ASSEMBLE 1. Locate thermostat phials into boiler pocket. 2. Locate the base of the control chassis into the bottom of the door way aperture, tilt the chassis backwards into position and secure with the four screws. 3. Thread the two wires for the selector switch through the aperture and connect them onto the rear of the selector switch fitted in the outer panel. Connect the ORANGE wire on 1 and the PURPLE wire on Refix the outer panel in position and secure with the 2 screws. 5. Replace the thermostat knobs. 6. Replace the controls door. Fig. 37 DESN

28 Replacement of parts (Vent fan) BEFORE REMOVING SERVICE ACCESS COVERS ENSURE THAT ALL ELECTRICAL SUPPLIES TO THE APPLIANCE HAVE BEEN TURNED OFF (SWITCH OFF AND REMOVE PLUG). SEE FIG. 38 VENT FAN 1. Remove (2) fan cover securing screws, remove cover. 2. Disconnect green/yellow lead from earth post. 3. Disconnect blue and brown leads from terminal block. 4. Break fan duct connection, remove fan assembly. 5. Remove (2) venturi securing screws. 6. Remove fan venturi assembly and gasket from fan. 7. Fit new fan, re-assemble in reverse order. Fig. 38 DESN VENT FAN SWITCH SEE FIG Remove (2) fan cover securing screws, remove cover. 2. Disconnect push on leads. 3. To remove switch of the cover panel press the two toggles, at top and bottom of switch, push switch, through panel. 4. Push replacement switch into aperture and click into place. The switch should be fitted with terminal 1 at the top. 5. Re-assemble in reverse order Fig. 39 DESN A 28

29 PUMP OVERRUN FACILITY When the programmer switches off the BOILER channel then the water circulating pump will be switched off. If during the period shortly after this the residual heat in the appliance causes the water temperature in the boiler to rise above 65 C then the pump overrun thermostat will change over. This will switch on the circulating pump. BOILER Electrical Controls OVERHEAT SAFETY THERMOSTATS This thermostat is a safety cut-out device which is intended to operate if the other controls fail. This control will lock-out and switches everything off except for the programmer clock and the Pump Overrun facility. This thermostat has to be manually reset once the temperature has cooled down. COOKER This thermostat is a safety cut-out device which operates if the oven control thermostat fails. This thermostat automatically resets once the temperature has cooled down. 29

30 Electrical Controls CONTROL CIRCUIT-EXTERNAL TERMINAL STRIP CONNECTIONS OVEN VENT FAN N SPARE NEUTRAL TERMINAL SW/L BOILER HTG ON H/W OFF SWITCH LIVE TO OPERATE BOILER FROM ROOM STAT OR CYLINDER STAT VIA ZONE VALVES IF FITTED TO ROOM STAT/ZONE VALVE(S) ETC ( IF FITTED) FROST STAT (SEE NOTE BELOW) H/W ON PN NEUTRAL PL LIVE TO CYLINDER STAT/ZONE VALVE(S) ETC (IF FITTED). PUMP SUPPLY (THE CIRCULATING PUMP MUST BE CONNECTED DIRECTLY TO THIS SUPPLY) PUMP SUPPLY (THE CIRCULATING PUMP MUST BE CONNECTED DIRECTLY TO THIS SUPPLY) L LIVE N NEUTRAL 3 AMP PERMANENT SUPPLY E EARTH NOTE: If no Hot Water System Controls are used a link MUST be fitted between H/W ON and SW/L BOILER. If no Central Heating System Controls are used a link MUST be fitted between HTG ON and SW/L BOILER. If a Frost Thermostat is fitted it MUST be connected to SW/L BOILER and H/W OFF. 30

31 Electrical Controls CONTROL CIRCUIT-BOILER L1 Fig

32 Electrical Controls CONTROL CIRCUIT-COOKER L2 L2 Fig

33 WIRING DIAGRAM APPLIANCE - 440/460/480/499KB Fault Finding Fig

34 Fault Finding Burners BURNER DOES NOT START Check that the burners have not gone to lock-out. Causes of lock-out can be:- l No ignition, ignition electrode incorrectly positioned, insulation cracked, spark generator fault. l No oil supply. l Poor combustion. l Photo electric cell incorrectly positioned, cracked or needs cleaning. l Live and Neutral connections reversed. l Faulty control box. l Faulty fire valve. l Faulty relays. REFER TO FLOW DIAGRAM FOR ELIMINATION PROCEDURE. General You can carry out some checks on the controls before you need to access the controls compartment behind the control door. If only one of the burners is not running then the fault must be after the safety overheat thermostat. Conversely if both burners are affected then the fault lies before the programmer connections. For access to individual controls refer to section Replacement Parts and for wiring continuity checks refer to Figs. 40, 41 and 42 for detailed and schematic wiring diagrams. To check out the electrical wiring at the burners you will first have to access the burner chamber. Use the following procedure:- 1. Isolate the electrical power supply. 2. Open up the bottom burner access door. Remove door and put in a safe place. 3. Unscrew the 4 screws holding the inner panel in place and remove panel. 4. Unscrew the 3 screws holding the louvered plinth in place and remove plinth. The external mains connections are made to a terminal block situated in the front left-hand corner of the burner chamber. Re-connect the electrical supply and check that there is 230V power supply available cross the mains input connection L & N on the terminal block, if not then check connecting leads, fuses and whether power is available at mains plug. If power is available across L & N then check to see whether the overheat cut-out switch has cut-out., if it has been reset by pushing the centre with a small round tool (i.e. a pencil). Check for continuity across the cooker overheat thermostat. 34

35 Cooker Burner (Control Box Type - DKO 970) Information system Fault Finding The information system communicates with the outside world using a LED (the used Flash-Code is similar to the Morse Code). The messages are optically transmitted by flashing appropriately a LED. Using an (optional) additional terminal the messages can be recorded and displayed in easily readable form. Programming sequence display The built-in microprocessor controls not only the programming sequence but the information system too. The individual phases of the programming sequence are displayed as Flash-Code. The following messages can be distinguished:- Fig

36 Fault Finding Cooker Burner (Control Box Type - DKO 970) In case of failure the LED is permanently illuminated. Every 10 seconds the illumination is interrupted by a flash code which indicates the cause of the error. Therefore the following sequence is performed which is repeated as long as the unit is not reset. Sequence: Stray Light Monitoring The stray light check is performed at the end of the pre-purge timer for the duration as mentioned in the table of timings. Low-voltage protection at 220 / 240V (110 / 120V) nominal usage The mains voltage has to be more than 187Veff (94Veff) in order to allow the unit to perform a start-up. The mains voltage is not only mentioned in the start-up phase but also permanently during operation. If the voltage drops below <160Veff (80Veff) during start-up or run time the control box goes into lock-out mode. If the voltage rises again, the control box performs automatically a start-up as soon as the mains voltage is >187Veff (94Veff). 36

37 Cooker Burner (Control Box Type DKO 970N) - Information system Fault Finding The information system is microprocessor based and reports on all aspects of burner control box operation and flame supervision. It informs continuously about the actual programming sequence the unit is just performing. Besides monitoring of the programming sequence it also allows to identify errors during start-up of operation without any additional testing devices. The automatically performed diagnoses is a valuable tool which facilitates service/maintenance work and therefore saves costs. The analyses of the error cause can be done directly on stage or if not possible afterwards at the lockout reason is stored in a non-volatile lock out mode memory. The information system communicates with the outside world using a LED (the used Flash-Code is similar to the Morse- Code). The messages are optically transmitted by flashing apprioriately a LED. Using an (optional) additional terminal the messages can be recorded and displayed in easy readable form. Programming sequence display The built-in microprocessor controls not only the programming sequence but the information system too. The individual phases of the programming sequence are displayed as Flash-Code. The following messages can be distinguished: Fig. 44 DESN Lock-out diagnoses In case of failure the LED is permanently illuminated. Every 10 seconds the illumination is interrupted by a flash code, which indicates the cause of the error. Therefore the following sequence is performed which is repeated as long as the unit is not reset. Sequence: Blinking Codes: See Fig. 44A Stray Light Monitoring The stray light check is performed at the end of the pre-purge time for the duration as mentioned in the table of timings Table of timings (sec.) Model Pre-purge and pre-ignition time tv1 stray light monitoring tf safety time ts post-ignition time after v1 tn delay time to V2 DKO 972-N-only tv

38 Fault Finding Fig. 44A DESN

39 39 Fault Finding

40 Fault Finding 40

41 41 Fault Finding

42 Fault Finding 42

43 43 Fault Finding

44 For further advice or information contact your local distributor/stockist With AGA Rangemaster s policy of continuous product improvement, the Company reserves the right to change specifications and make modifications to the appliance described at any time. Manufactured by AGA Rangemaster Station Road Ketley Telford Shropshire TF1 5AQ England